Recently, magnetic resonance imaging has changed the way the world
looks at radiology. With the evolution of magnetic resonance imaging,
quality assurance images of the biological structure of a patient can
now be produced. However, conventional MRI reconstruction methods
often fail. This is because they are affected by poor image quality
due to artifacts and noise, not to mention the long imaging times.
Such issues have caused many to turn their heads towards GANs.
• Magnetic Resonance Imaging (MRI) is a critical tool in medical
diagnostics, yet its acquisition speed remains a challenge. This
report presents the challenges of Client Selection(CS), cGAN’s
with Federated Learning (FL) to enhance MRI reconstruction
from under-sampled k-space data; Leading to faster convergence,
improved model accuracy, and more efficient use of resources
• Using the privacy-preserving benefits of FL with (CS) and the
generative capabilities of cGANs, the proposed model achieves
the promising approaches of federated learning by addressing the
concerns that enable collaborative model training across multiple
decentralized institutions without sharing sensitive patient data.
Reconstructing MRI using federated learning aims to achieve
both high-quality and accurate image reconstruction while maintaining
data confidentiality.
• In this research paper, we aim to achieve high reconstruction
accuracy and data confidentiality by proposing a new approach
for reconstructing MRI using federated learning.
• First, this dissertation proposes a framework for adaptive client
selection for federated MRI reconstruction that combines Dual
Conditional GANs (Dual-cGANs) and federated learning (FL) to
respond to important issues in the medical imaging landscape:
Privacy-preservation: Enables collaborative efforts across multiple
institutions without sharing the raw data.
Heterogeneous Data that leverages a client-local model to accommodate
non-IID data. Resource Efficiency achieves 95/100
accuracy (compared to 90/100 for FedAVG) while reducing communication
costs by 45/100 and converging 40/100 faster. Reconstruction
Quality which produces realistic MRI images conditioned
on the medical attributes of patients (i.e., age, sex, health
condition) using Dual-cGANs.
Key original contributions include:
Client scoring (optimally weighted:
Si = α ·Mi + β · Qi + γ · Pi
The ability to leverage FL-GAN dynamics to create synthetic
data for domain adaptation.
Resource-aware selection: Selected clients with substantial contributions
to federated training and reduced the effect of stragglers.
Evaluated against the IXI and FastMRI datasets, the approach
is shown to improve upon accuracy and privacy for practitioners
while maintaining the ability to scale for clinical use.
• Finally, experimental results were conducted via Google Colaboratory
GPU Environment, which is a cloud-based platform
that typically provides access to NVIDIA Tesla series GPUs to
demonstrate significant improvements in reconstruction fidelity,
highlighting superior accuracy, privacy, and scalability for clinical
deployment.